/**
 * \file emscripten.c
 * Emscripten example of using the single-file \c zstddeclib. Draws a rotating
 * textured quad with data from the in-line Zstd compressed DXT1 texture (DXT1
 * being hardware compression, further compressed with Zstd).
 * \n
 * Compile using:
 * \code
 *	export CC_FLAGS="-Wall -Wextra -Werror -Os -g0 -flto --llvm-lto 3 -lGL -DNDEBUG=1"
 *	export EM_FLAGS="-s WASM=1 -s ENVIRONMENT=web --shell-file shell.html --closure 1"
 *	emcc $CC_FLAGS $EM_FLAGS -o out.html emscripten.c
 * \endcode
 * 
 * \author Carl Woffenden, Numfum GmbH (released under a CC0 license)
 */

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <emscripten/emscripten.h>
#include <emscripten/html5.h>

#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>

#include "../zstddeclib.c"

//************************* Test Data (DXT texture) **************************/

/**
 * Zstd compressed DXT1 256x256 texture source.
 * \n
 * See \c testcard.png for the original.
 */
static uint8_t const srcZstd[] = {
	0x28, 0xb5, 0x2f, 0xfd, 0x60, 0x00, 0x7f, 0x6d, 0x61, 0x00, 0x0a, 0x66,
	0xec, 0x17, 0x48, 0x60, 0x1c, 0x5a, 0xc9, 0x5d, 0x1a, 0x38, 0x07, 0xe8,
	0xc5, 0x82, 0x99, 0x68, 0xe6, 0x95, 0x45, 0x58, 0x0d, 0x0c, 0xf3, 0x36,
	0xc8, 0xd9, 0x0f, 0x46, 0x2d, 0x68, 0x11, 0xf8, 0x31, 0x10, 0xa1, 0x1a,
	0x2f, 0x99, 0x5c, 0x84, 0xfd, 0x92, 0x02, 0xe6, 0x3b, 0x44, 0x9b, 0x01,
	0x5d, 0x92, 0xff, 0x38, 0x26, 0x00, 0x6a, 0x6b, 0xc3, 0x53, 0xb2, 0x0c,
	0x25, 0xf3, 0xd8, 0x59, 0x68, 0x9b, 0x14, 0x8a, 0x89, 0x75, 0x18, 0x03,
	0x1d, 0xc9, 0x0f, 0x63, 0x01, 0x73, 0x01, 0x72, 0x01, 0x4f, 0x66, 0x31,
	0x58, 0x0f, 0x97, 0x4b, 0x0c, 0x4c, 0x06, 0xac, 0x07, 0x0b, 0x68, 0xd4,
	0xad, 0x80, 0x64, 0x13, 0x74, 0xa1, 0x12, 0x16, 0x58, 0xcf, 0x1a, 0x95,
	0x5f, 0x0d, 0x26, 0x55, 0xd0, 0x9c, 0xf4, 0x52, 0x35, 0x2e, 0x20, 0xc1,
	0x06, 0x69, 0x03, 0x0a, 0x93, 0x83, 0x5e, 0x27, 0x9b, 0x4c, 0x6d, 0xee,
	0x87, 0x03, 0x30, 0x6c, 0x46, 0xd7, 0x50, 0x5c, 0xca, 0xe6, 0xa6, 0x4d,
	0xa8, 0xf6, 0xab, 0xd7, 0x0e, 0x27, 0x27, 0x90, 0xc4, 0xb2, 0xd1, 0x10,
	0xfa, 0x43, 0x82, 0xc8, 0xf2, 0xe5, 0xff, 0xff, 0xd5, 0x52, 0x62, 0x43,
	0x87, 0x26, 0x2a, 0x05, 0x70, 0x0e, 0xb0, 0x2f, 0xc4, 0x56, 0xef, 0xb5,
	0xca, 0xb8, 0x53, 0xb7, 0x96, 0x0e, 0xe7, 0x00, 0x2c, 0xa8, 0xda, 0x3b,
	0x07, 0x70, 0xa7, 0x78, 0x38, 0x60, 0x87, 0x7a, 0x01, 0x3b, 0x75, 0xec,
	0xfa, 0x77, 0xe2, 0x46, 0x94, 0x61, 0x8e, 0x0d, 0x0c, 0xfb, 0xe7, 0x8b,
	0x13, 0x50, 0x31, 0xa9, 0x27, 0xcd, 0x27, 0xef, 0x6b, 0xa6, 0xab, 0x9c,
	0x4d, 0x95, 0x6c, 0x3a, 0xbb, 0x8e, 0x96, 0x92, 0x18, 0x5a, 0x7c, 0x4f,
	0xff, 0x7b, 0x38, 0xf2, 0xdb, 0x86, 0xde, 0xff, 0x1f, 0x2f, 0x21, 0x86,
	0x7d, 0xbf, 0x45, 0xd0, 0x6e, 0x77, 0x0a, 0xee, 0x0a, 0xee, 0x14, 0x9a,
	0xb8, 0x84, 0xf3, 0xac, 0xbe, 0xc8, 0x7f, 0x8d, 0xff, 0xff, 0xcf, 0x2a,
	0xfb, 0x69, 0xfc, 0xfb, 0xfd, 0x7a, 0x10, 0x22, 0x36, 0xfc, 0xff, 0x3f,
	0xcf, 0xd0, 0xf1, 0x7f, 0xfe, 0xff, 0x3d, 0x24, 0xdf, 0x78, 0x4a, 0xff,
	0xda, 0x9c, 0x39, 0xcf, 0xef, 0xe7, 0xfd, 0x52, 0x98, 0xb5, 0x40, 0x92,
	0xee, 0xdd, 0x99, 0xf5, 0x53, 0x5b, 0x65, 0x6b, 0xb5, 0xd8, 0x7b, 0xae,
	0xfa, 0xc1, 0x0f, 0x0c, 0x7f, 0x4f, 0x55, 0xa3, 0xad, 0x2c, 0xa0, 0xbd,
	0xf7, 0x2a, 0x0e, 0xe8, 0xbd, 0xc7, 0x5e, 0xf5, 0xd8, 0x54, 0x9e, 0x56,
	0xa3, 0xd6, 0x59, 0xd5, 0xfe, 0x1f, 0xc0, 0x30, 0x8c, 0xfc, 0x46, 0x04,
	0xae, 0x60, 0xbc, 0xe8, 0xcf, 0xec, 0x3d, 0xde, 0xf9, 0xf0, 0xfe, 0xef,
	0x7d, 0xcc, 0xf7, 0x2b, 0xe5, 0x1b, 0x70, 0xff, 0xff, 0x7e, 0x3f, 0x6e,
	0xe4, 0x02, 0x07, 0xfc, 0x1b, 0x7a, 0xff, 0xe7, 0x58, 0xfc, 0x7e, 0x3a,
	0xdc, 0x97, 0xfd, 0x57, 0xef, 0xa3, 0xfc, 0x2a, 0xc7, 0x4d, 0xf3, 0xcb,
	0x9d, 0xce, 0xac, 0xfe, 0xeb, 0x2e, 0x86, 0xb9, 0x69, 0x54, 0xef, 0xf9,
	0x55, 0xcf, 0xff, 0x48, 0x24, 0x72, 0x3a, 0x9d, 0x72, 0x2f, 0x2f, 0x2f,
	0xff, 0x3f, 0xe7, 0x01, 0x6c, 0x4d, 0x6c, 0xcd, 0x2d, 0x5b, 0x53, 0xb7,
	0x59, 0x22, 0x08, 0x0b, 0xa7, 0x92, 0x15, 0x75, 0x93, 0xb0, 0x5d, 0xaf,
	0x2a, 0x63, 0x95, 0x1d, 0x25, 0xd2, 0xd2, 0xa8, 0x1c, 0x84, 0xc9, 0xdc,
	0x72, 0xba, 0xd7, 0xfc, 0x69, 0xf5, 0xc7, 0x19, 0xa9, 0xbe, 0xfa, 0x26,
	0x55, 0x25, 0x75, 0xb7, 0x60, 0xa3, 0xd8, 0x68, 0x54, 0xb7, 0x1b, 0xa5,
	0x54, 0x62, 0xb1, 0x49, 0xde, 0xe2, 0xac, 0xa2, 0xe8, 0x7b, 0xff, 0x5f,
	0x75, 0x4e, 0xb8, 0xa2, 0xdd, 0x6a, 0xb7, 0xda, 0x6e, 0x2e, 0x04, 0xcd,
	0x08, 0x2f, 0xec, 0x8e, 0x49, 0xaf, 0x49, 0x6f, 0x8b, 0x4f, 0x2e, 0x1a,
	0xc5, 0x62, 0x7b, 0x6b, 0x3e, 0x32, 0x3e, 0x32, 0xbe, 0x08, 0x35, 0x4d,
	0x63, 0x93, 0xa6, 0xc8, 0x42, 0xe6, 0x21, 0xcc, 0x59, 0xc8, 0x4c, 0xe5,
	0x86, 0xe1, 0x03, 0x06, 0xa4, 0xec, 0xff, 0xb7, 0x78, 0x7e, 0x62, 0x43,
	0xc7, 0x2c, 0x50, 0x30, 0x4a, 0xc8, 0x9b, 0xf3, 0xbf, 0xe6, 0x62, 0xa0,
	0x50, 0xa6, 0x9c, 0xe3, 0x6e, 0x5b, 0xaf, 0x77, 0x8b, 0xbb, 0xe1, 0x70,
	0xaa, 0xaa, 0xaa, 0x92, 0xb4, 0x52, 0xad, 0x14, 0x87, 0x93, 0x0b, 0xe6,
	0x82, 0x39, 0x11, 0xb9, 0x20, 0x9a, 0x16, 0x34, 0x22, 0x68, 0xb2, 0x68,
	0xb2, 0x76, 0xd3, 0xe8, 0x6e, 0xda, 0x6b, 0x62, 0x34, 0x2e, 0x8d, 0xbd,
	0x2d, 0x3d, 0x6b, 0x4c, 0x26, 0x33, 0xda, 0x33, 0xf3, 0x91, 0x51, 0x46,
	0x79, 0xbd, 0x3e, 0x39, 0x9f, 0xcf, 0xd2, 0xb8, 0x5c, 0xfa, 0x22, 0xf8,
	0x8e, 0xb6, 0xbe, 0x08, 0x40, 0x14, 0x49, 0x40, 0x14, 0xf2, 0x0c, 0x2d,
	0x30, 0x85, 0x3c, 0x63, 0x29, 0xd3, 0x98, 0x85, 0x6c, 0xb5, 0xdb, 0xad,
	0x5c, 0x63, 0x9e, 0x72, 0xcf, 0x43, 0xe6, 0xaf, 0x77, 0xa6, 0xe2, 0x21,
	0x0c, 0x4d, 0xd3, 0x49, 0x1e, 0xc2, 0x14, 0x6f, 0xee, 0xdb, 0x7b, 0x7b,
	0x08, 0xb3, 0xa4, 0x60, 0x3b, 0x9d, 0x6e, 0x8b, 0x37, 0x4b, 0x0a, 0x74,
	0x35, 0x33, 0xbc, 0xf9, 0x64, 0x85, 0x63, 0x32, 0x29, 0x20, 0x59, 0x0c,
	0x3c, 0x96, 0x67, 0x62, 0xb7, 0x8a, 0x92, 0x4d, 0xa0, 0xd3, 0xf3, 0xd1,
	0x85, 0x80, 0x38, 0xcb, 0x64, 0x60, 0xc9, 0xb5, 0xaf, 0x97, 0x8d, 0x20,
	0x45, 0x28, 0xb8, 0xab, 0xe8, 0xc9, 0x0a, 0x88, 0x1f, 0xd6, 0x47, 0x54,
	0xf1, 0xd3, 0xfb, 0x62, 0xa7, 0xfd, 0xf2, 0x8b, 0xfd, 0xb6, 0xe4, 0x2e,
	0xb6, 0x91, 0x73, 0x1c, 0xd0, 0x7b, 0xba, 0x83, 0xc9, 0xac, 0x51, 0x39,
	0x92, 0xc5, 0x4f, 0x30, 0x1e, 0x2e, 0xd5, 0xf1, 0xa8, 0xa6, 0xa5, 0x80,
	0x70, 0xb9, 0xbc, 0xb7, 0xc2, 0x52, 0x32, 0x6c, 0xe3, 0x3d, 0xed, 0x41,
	0xa4, 0x4b, 0x31, 0x2a, 0xe6, 0x62, 0x11, 0x19, 0x95, 0x73, 0x1d, 0xbf,
	0xe1, 0x6c, 0xfc, 0x47, 0x75, 0x6c, 0x37, 0x63, 0x02, 0xf8, 0x34, 0x40,
	0x9a, 0x00, 0x1d, 0xf7, 0x32, 0x56, 0x77, 0xda, 0x5b, 0x9f, 0x9f, 0x0f,
	0xbb, 0x91, 0x5b, 0xbd, 0xe7, 0x58, 0x82, 0x4a, 0x20, 0xcd, 0x4f, 0x47,
	0x15, 0xf3, 0x51, 0xf1, 0x43, 0x51, 0x10, 0x96, 0xae, 0xba, 0xf7, 0x21,
	0x50, 0xef, 0x55, 0x27, 0x0c, 0x1f, 0xe0, 0x54, 0xf8, 0xc9, 0x69, 0xef,
	0xb9, 0x53, 0xf7, 0x83, 0x73, 0x9d, 0xce, 0x86, 0x07, 0x83, 0x44, 0x61,
	0x37, 0x35, 0x35, 0x33, 0x4e, 0x33, 0x33, 0x3e, 0x9f, 0x50, 0x48, 0x24,
	0xe6, 0xd0, 0x79, 0x49, 0xc3, 0x2d, 0xa0, 0x46, 0x31, 0x9a, 0x72, 0xc3,
	0x84, 0xff, 0x7a, 0x95, 0xbb, 0x00, 0x22, 0xcc, 0x14, 0x00, 0x04, 0xac,
	0x60, 0x64, 0x86, 0xe4, 0x6f, 0xb1, 0x58, 0xf4, 0xdc, 0xb0, 0x05, 0x00,
	0x72, 0x38, 0xf8, 0xce, 0xce, 0x8e, 0xcf, 0x37, 0x33, 0x43, 0x24, 0x0a,
	0x85, 0x33, 0x35, 0x35, 0x37, 0xc2, 0xa8, 0x28, 0x27, 0x1b, 0x9d, 0xce,
	0x29, 0x18, 0xe4, 0xfc, 0x09, 0x53, 0xa5, 0x51, 0xad, 0x74, 0x79, 0x7b,
	0xb5, 0x4a, 0x65, 0x94, 0x36, 0x89, 0xf5, 0x62, 0x9b, 0xd8, 0x9a, 0xe8,
	0x2b, 0xff, 0xa1, 0x73, 0xfe, 0x2e, 0x2c, 0x41, 0x45, 0x37, 0xef, 0x6e,
	0x7b, 0x38, 0xca, 0xa5, 0xd2, 0xb8, 0x1c, 0x3b, 0x96, 0x21, 0xbb, 0x5d,
	0xad, 0xd1, 0xdb, 0x1c, 0xf6, 0x5e, 0x4b, 0xd9, 0x59, 0x1b, 0x67, 0xf5,
	0x7a, 0x7c, 0x9a, 0x91, 0x3e, 0x8e, 0xe3, 0xee, 0x7b, 0xb9, 0xa4, 0xb9,
	0xf5, 0x70, 0xee, 0x1d, 0x4e, 0x4f, 0xcc, 0xd6, 0x7b, 0x07, 0x71, 0x48,
	0xf2, 0x06, 0xd0, 0x10, 0x82, 0x21, 0xe4, 0x55, 0x2e, 0xa5, 0x1d, 0xbe,
	0x48, 0x8c, 0x69, 0xbb, 0x24, 0x40, 0x68, 0x9b, 0xba, 0x5a, 0x5a, 0xa7,
	0xe2, 0xd1, 0xac, 0xc2, 0xd8, 0x87, 0x9c, 0xe3, 0x78, 0xee, 0xa6, 0xcd,
	0xdd, 0x68, 0x6e, 0xdd, 0xdb, 0x2e, 0xc6, 0xbb, 0x8b, 0xe9, 0xc1, 0xd9,
	0xf6, 0x62, 0x7e, 0x72, 0x7e, 0x72, 0x34, 0xe4, 0x68, 0xc8, 0x11, 0x32,
	0x10, 0x32, 0x20, 0x32, 0xf0, 0x12, 0x19, 0x90, 0xe0, 0x45, 0x91, 0xe0,
	0x25, 0x83, 0xba, 0xc9, 0x20, 0x26, 0x87, 0xa5, 0x72, 0xa9, 0x64, 0x72,
	0x80, 0x21, 0x54, 0x13, 0xeb, 0x29, 0x18, 0x42, 0x34, 0x84, 0x94, 0x34,
	0x84, 0xa4, 0x1d, 0xa4, 0x1d, 0x82, 0x1c, 0xef, 0xaf, 0x0e, 0x63, 0x47,
	0x6d, 0x10, 0xb9, 0xec, 0xd8, 0x2d, 0x3b, 0x9e, 0x21, 0xb1, 0x67, 0x48,
	0x34, 0x24, 0x1a, 0x52, 0xdb, 0xa4, 0x6d, 0x62, 0xd3, 0xfa, 0xff, 0xfa,
	0x03, 0x34, 0xef, 0x9d, 0xc9, 0xe1, 0x5d, 0xec, 0xf5, 0xf1, 0x79, 0x8c,
	0x97, 0xd2, 0x24, 0xc1, 0x2d, 0xe0, 0x39, 0x16, 0x1e, 0xa9, 0x41, 0xc3,
	0xbf, 0x4a, 0xd9, 0x3c, 0xea, 0x77, 0x96, 0x55, 0xe6, 0x95, 0xc3, 0xf1,
	0x8e, 0x7b, 0x4f, 0xad, 0x61, 0xf8, 0xe7, 0x01, 0xad, 0x46, 0xf5, 0x2c,
	0xac, 0x55, 0x2c, 0x94, 0xaa, 0x46, 0xfb, 0x5e, 0xcd, 0xaa, 0x1f, 0x78,
	0x4f, 0x2f, 0xd1, 0xc9, 0x02, 0xd6, 0x2c, 0x67, 0xef, 0x3f, 0x54, 0xab,
	0xda, 0x03, 0x79, 0x1f, 0xab, 0xfd, 0x0c, 0x38, 0x3c, 0xbc, 0xe1, 0xd5,
	0x01, 0xf6, 0xfb, 0xfb, 0xf1, 0x70, 0xee, 0xfd, 0x90, 0x13, 0x97, 0xc4,
	0xbc, 0x08, 0xe7, 0x4b, 0x88, 0x34, 0xf7, 0x56, 0x1e, 0x0c, 0xdb, 0xe4,
	0x9c, 0x78, 0xf1, 0xf4, 0x62, 0x4c, 0xb5, 0xf7, 0xdd, 0xd9, 0x4c, 0x5a,
	0x69, 0xa6, 0x36, 0x27, 0x03, 0xbe, 0x86, 0xc2, 0x72, 0xa2, 0x60, 0x73,
	0xf1, 0xe0, 0x17, 0x50, 0xb5, 0x93, 0x81, 0xac, 0xf1, 0xc9, 0xd4, 0x66,
	0x73, 0x71, 0xce, 0x63, 0xa8, 0x60, 0x98, 0xda, 0x86, 0x46, 0x72, 0xec,
	0x54, 0xc1, 0xe6, 0x8a, 0x10, 0x23, 0x2d, 0x0c, 0xdd, 0x44, 0x0b, 0xa0,
	0x44, 0xa4, 0x9d, 0x0e, 0x64, 0x31, 0x30, 0x45, 0xb1, 0x97, 0x4c, 0x6d,
	0x9f, 0x43, 0x99, 0x71, 0xa8, 0x9a, 0xe6, 0xbd, 0x3a, 0xe1, 0xff, 0x7f,
	0x33, 0x61, 0xf1, 0x48, 0xda, 0x48, 0x28, 0x10, 0x23, 0x9b, 0x24, 0xeb,
	0xee, 0xbd, 0x35, 0x0e, 0x6e, 0x75, 0x23, 0x20, 0xd6, 0x95, 0x8c, 0xa5,
	0x24, 0xec, 0x44, 0x67, 0x52, 0x2e, 0x78, 0x2a, 0xba, 0x3e, 0x3a, 0x4e,
	0xc9, 0x5c, 0x23, 0xb0, 0xd5, 0xfb, 0x29, 0xaf, 0x9a, 0x0b, 0x90, 0x89,
	0xd8, 0xec, 0xa9, 0xa8, 0x13, 0xfc, 0x22, 0xfa, 0xf2, 0x74, 0x2f, 0x4e,
	0x35, 0xb0, 0x6d, 0x6c, 0xfd, 0xc4, 0xfe, 0xd0, 0x98, 0x3d, 0xe5, 0x43,
	0x0a, 0xd0, 0x33, 0x26, 0x3b, 0x12, 0x7d, 0x65, 0xa1, 0xff, 0xff, 0x6f,
	0x53, 0x0e, 0x28, 0x84, 0xa7, 0xa2, 0x2e, 0xf8, 0x4a, 0xb6, 0xa1, 0x47,
	0xf5, 0xd0, 0x13, 0x9d, 0xd9, 0x50, 0xef, 0x9f, 0x31, 0xb4, 0x13, 0x67,
	0xf9, 0x0a, 0x99, 0xb5, 0x80, 0xec, 0x4a, 0x1a, 0x59, 0x21, 0x3b, 0xce,
	0xc5, 0x7e, 0x96, 0x85, 0x92, 0xc5, 0xb0, 0x75, 0xaa, 0x41, 0x16, 0xa9,
	0xd3, 0xde, 0x13, 0x7d, 0xd9, 0x61, 0x30, 0x1c, 0x73, 0x61, 0x54, 0x90,
	0xcf, 0xd4, 0xe8, 0xfe, 0xbf, 0xbf, 0x36, 0x57, 0x26, 0x38, 0xab, 0x06,
	0xc4, 0x7e, 0x3c, 0x5b, 0x35, 0xd2, 0x7c, 0x2c, 0x0a, 0x82, 0xf2, 0xa8,
	0xf2, 0x8b, 0x48, 0xa9, 0x90, 0x00, 0x01, 0x10, 0x10, 0x14, 0x04, 0x00,
	0x32, 0xa2, 0x06, 0x82, 0x28, 0x90, 0xc2, 0xb4, 0x85, 0xda, 0x01, 0x52,
	0xe9, 0x18, 0x85, 0x60, 0x00, 0x00, 0x20, 0x0c, 0x00, 0x14, 0x41, 0x00,
	0x40, 0xa0, 0x04, 0x40, 0x00, 0x80, 0x50, 0x03, 0x01, 0x10, 0x18, 0x01,
	0x80, 0xd4, 0x14, 0x99, 0x01, 0xfd, 0x07, 0xf8, 0x16, 0x0e, 0xd9, 0x5d,
	0xa3, 0x70, 0xfe, 0xda, 0x17, 0xfa, 0xce, 0x46, 0x9a, 0x99, 0x81, 0x1a,
	0x39, 0xba, 0x63, 0xb1, 0x18, 0x11, 0x58, 0xd7, 0xc7, 0xba, 0x03, 0x3e,
	0x01, 0xf2, 0xf9, 0x4e, 0x12, 0xa3, 0x50, 0x7b, 0xaf, 0x7b, 0x60, 0x5c,
	0x83, 0x23, 0xd2, 0x60, 0x27, 0x84, 0xad, 0xb8, 0x02, 0xed, 0xfe, 0xb4,
	0x9c, 0x08, 0x9f, 0x49, 0xae, 0x55, 0x02, 0x94, 0xc0, 0x1b, 0x90, 0x75,
	0x0b, 0x90, 0xc4, 0xc7, 0x43, 0x9e, 0x67, 0x25, 0x70, 0x61, 0x0d, 0xb8,
	0x7a, 0x97, 0x43, 0xfc, 0xd1, 0x7e, 0x68, 0xed, 0x03, 0xb7, 0x1e, 0x75,
	0xe9, 0x4d, 0x7a, 0x23, 0x18, 0x37, 0x63, 0x6f, 0xab, 0x5f, 0x7c, 0x5b,
	0x1c, 0x05, 0xdf, 0x3f, 0x00, 0x86, 0x37, 0xa0, 0xfa, 0x0c, 0xe0, 0xed,
	0x35, 0x35, 0x2f, 0xd8, 0xd1, 0x75, 0xba, 0x37, 0x34, 0x7e, 0xb0, 0x84,
	0x2a, 0x01, 0x0c, 0x98, 0xed, 0x47, 0xf9, 0x86, 0x81, 0x74, 0x00, 0x5d,
	0x8b, 0x4c, 0x18, 0x8a, 0x31, 0xcd, 0xae, 0x07, 0x44, 0xb5, 0xd5, 0x07,
	0xa0, 0xdf, 0xf4, 0xfa, 0xa6, 0x42, 0xd0, 0x4f, 0x17, 0xd8, 0xdf, 0xb6,
	0x34, 0x44, 0xe3, 0x01, 0xc4, 0xb6, 0x2d, 0xb5, 0x56, 0xc6, 0x2a, 0x1f,
	0x05, 0x6c, 0x35, 0xe0, 0x09, 0x31, 0xef, 0x60, 0xfe, 0xaf, 0x07, 0x80,
	0x32, 0xa0, 0xe9, 0xd3, 0x96, 0x45, 0xa7, 0xaa, 0xb6, 0xfb, 0x03, 0x10,
	0xe3, 0x97, 0x96, 0x8d, 0x3a, 0x01, 0xdd, 0x58, 0x58, 0x78, 0x00, 0xab,
	0xff, 0x06, 0xa0, 0xd6, 0x01, 0x58, 0x08, 0xb7, 0xdc, 0x2d, 0xa7, 0xfb,
	0x22, 0xa8, 0x67, 0x00, 0xe3, 0xcf, 0x82, 0x43, 0xfc, 0x96, 0x1b, 0x40,
	0x63, 0xcf, 0x9d, 0x42, 0x5d, 0x66, 0x40, 0xaa, 0xaf, 0x28, 0x94, 0xd3,
	0x2a, 0xd4, 0x02, 0x13, 0xd2, 0xdf, 0x03, 0x9c, 0x60, 0x6b, 0x16, 0x94,
	0xb4, 0xbe, 0x62, 0xc2, 0x35, 0x60, 0x45, 0x09, 0x23, 0x5a, 0xe0, 0x85,
	0xb3, 0x03, 0x50, 0x68, 0x0c, 0x20, 0xa5, 0xf9, 0x94, 0xd2, 0x35, 0x80,
	0xad, 0x4c, 0x4e, 0x40, 0x41, 0x97, 0x92, 0x75, 0xbe, 0x0c, 0x03, 0x50,
	0x85, 0x08, 0xaf, 0x36, 0x00, 0x68, 0xaf, 0x09, 0xb3, 0x0c, 0x20, 0x4f,
	0x81, 0x6a, 0x6a, 0xf5, 0x0d, 0x70, 0x69, 0x00, 0x4c, 0xb4, 0x0f, 0x59,
	0xe7, 0x31, 0x0a, 0x45, 0x9f, 0xde, 0x90, 0xd6, 0x38, 0x80, 0x6b, 0x2c,
	0xb9, 0x2f, 0xd4, 0x01, 0x40, 0x14, 0xd5, 0xed, 0x8e, 0x01, 0x53, 0xbf,
	0x03, 0x18, 0x1e, 0xb0, 0xc1, 0x85, 0x32, 0xec, 0x78, 0x2b, 0xf0, 0xbb,
	0xbb, 0x6c, 0xf3, 0x4d, 0xdc, 0x73, 0x40, 0xfd, 0x10, 0x09, 0x9e, 0x20,
	0xe2, 0x12, 0x8c, 0xe0, 0xd2, 0xed, 0x80, 0x6b, 0xcc, 0x78, 0x20, 0x03,
	0xd0, 0x5e, 0x06, 0xf4, 0xb0, 0xc4, 0x0e, 0x15, 0x1d, 0x80, 0xb4, 0x76,
	0xdf, 0x49, 0x03, 0x50, 0x82, 0xad, 0xda, 0x8b, 0x5a, 0x61, 0xc2, 0x5e,
	0xb5, 0x1e, 0x46, 0xc0, 0xde, 0xaa, 0x0e, 0x15, 0x06, 0xd2, 0xf4, 0xb2,
	0xd1, 0xed, 0x38, 0x0a, 0x03, 0x18, 0x33, 0x1a, 0x80, 0x61, 0x3e, 0xec,
	0x7c, 0x74, 0xa8, 0x1d, 0x80, 0x1a, 0xce, 0x25, 0x1d, 0x41, 0xd1, 0xc1,
	0x03, 0x28, 0xb5, 0xaf, 0x72, 0x9c, 0x59, 0x7a, 0xe1, 0x7d, 0xc0, 0xa5,
	0x08, 0x1e, 0x18, 0x24, 0xfa, 0xbd, 0x99, 0x4a, 0x31, 0xa0, 0xea, 0xee,
	0xf8, 0x36, 0x60, 0x98, 0xc9, 0x10, 0xd1, 0xa7, 0x35, 0x00, 0x8d, 0x40,
	0x8e, 0x5a, 0x35, 0x0f, 0x80, 0xb1, 0xd4, 0x32, 0x79, 0x40, 0x34, 0x05,
	0x7e, 0x98, 0xc6, 0x80, 0x3e, 0x90, 0x01, 0x65, 0xf4, 0x80, 0x73, 0x08,
	0x64, 0xd7, 0x36, 0xc1, 0x7c, 0xc0, 0x5c, 0x75, 0x00, 0xc5, 0x09, 0x58,
	0x9c, 0x13, 0x01, 0x72, 0x37, 0x9b, 0x79, 0xe4, 0x05, 0xd1, 0x01, 0x04,
	0x98, 0x08, 0x74, 0xfd, 0xfc, 0x3f, 0x1c, 0x00, 0x73, 0x01, 0xfc, 0x1c,
	0xcc, 0x16, 0x43, 0x19, 0x1d, 0xac, 0x61, 0x4b, 0x11, 0xc2, 0xa0, 0xf2,
	0x01, 0x0b, 0x7b, 0x3b, 0xf4, 0xfc, 0x58, 0x5d, 0x2d, 0x5c, 0x01, 0x8c,
	0x62, 0x17, 0x78, 0xbe, 0x60, 0x8c, 0x01, 0x6f, 0x91, 0x49, 0x65, 0x54,
	0x92, 0xe9, 0x01, 0x1e, 0x10, 0x77, 0x35, 0x00, 0xa8, 0xd4, 0xc7, 0x71,
	0x07, 0xd8, 0xcd, 0xa3, 0x7d, 0x69, 0x20, 0xac, 0x07, 0x00, 0x35, 0xc7,
	0x62, 0xee, 0x8c, 0x7d, 0x0c, 0xb8, 0x43, 0x0e, 0x00, 0x08, 0xfb, 0xe7,
	0xec, 0x33, 0x37, 0x04, 0x80, 0x2d, 0x1d, 0xa6, 0x13, 0x34, 0x1b, 0x1d,
	0xc0, 0xca, 0x00, 0x92, 0xed, 0x2e, 0x56, 0xbe, 0x91, 0x80, 0x0c, 0x88,
	0xa6, 0x01, 0xdf, 0x7f, 0x90, 0x49, 0xed, 0x0c, 0xe0, 0x08, 0x73, 0x28,
	0x74, 0xc7, 0xe1, 0xb1, 0x03, 0x5d, 0xc5, 0xab, 0x61, 0x42, 0xdf, 0x03,
	0x43, 0xf3, 0x35, 0x04, 0xcf, 0xc6, 0x1d, 0x79, 0x07, 0x40, 0x22, 0xe4,
	0x68, 0x0d, 0x01, 0x95, 0xad, 0x72, 0x69, 0x00, 0x39, 0x9d, 0x53, 0x8f,
	0x13, 0x0d, 0xb0, 0x29, 0x79, 0x1a, 0x39, 0x20, 0x12, 0x28, 0x9b, 0x02,
	0x8f, 0x74, 0x90, 0x4c, 0xe8, 0xd1, 0x57, 0xf4, 0x01, 0x44, 0x04, 0xe0,
	0x0c, 0x82, 0x91, 0xc5, 0x4f, 0x8f, 0xc6, 0x00, 0x43, 0x85, 0x65, 0xc8,
	0xe6, 0x34, 0x1d, 0x80, 0xc0, 0xca, 0xdb, 0x57, 0x6c, 0x00, 0x72, 0x42,
	0x5f, 0xd0, 0x49, 0x57, 0x47, 0xd4, 0x97, 0x18, 0x18, 0x80, 0x68, 0x8e,
	0x0a, 0xf1, 0x6b, 0x34, 0xf1, 0x60, 0x2c, 0x41, 0x29, 0xd3, 0x3d, 0x55,
	0x95, 0xb1, 0x3c, 0xd4, 0x95, 0x42, 0xef, 0xe7, 0xca, 0x00, 0x2e, 0xce,
	0x25, 0xc2, 0xca, 0xf5, 0x00, 0x17, 0x3b, 0x8c, 0x42, 0x88, 0x03, 0xde,
	0x97, 0xe1, 0x3a, 0x74, 0xb0, 0x33, 0xe0, 0x8f, 0x47, 0xeb, 0x2a, 0x5f,
	0x36, 0x3e, 0x5a, 0xff, 0xc5, 0x80, 0xb9, 0x13, 0xa9, 0x1f, 0xf8, 0x86,
	0xc9, 0x51, 0xf8, 0x4c, 0xaa, 0xe1, 0x65, 0x80, 0xb0, 0x8b, 0x91, 0xec,
	0xcc, 0xbf, 0x70, 0x19, 0x98, 0x03, 0x10, 0xf0, 0x38, 0x40, 0xc4, 0x65,
	0xbe, 0x41, 0xb2, 0x58, 0x3f, 0xe0, 0xcc, 0x0e, 0x08, 0x2b, 0x73, 0xf4,
	0xdd, 0x86, 0x06, 0xa0, 0xc6, 0x8f, 0x1a, 0x32, 0x66, 0x50, 0x8e, 0xe1,
	0x59, 0x67, 0x00, 0xed, 0x66, 0x1d, 0xdd, 0xfa, 0x7b, 0xe2, 0x56, 0x89,
	0xd9, 0xa0, 0x4f, 0x41, 0x94, 0x28, 0xb8, 0xc6, 0xc7, 0x64, 0xde, 0x9b,
	0x64, 0x44, 0x33, 0x39, 0xb5, 0x6c, 0xb9, 0x42, 0xe7, 0x7e, 0x16, 0xd2,
	0x01, 0x12, 0x03, 0xb3, 0x48, 0x47, 0x6b, 0x75, 0x26, 0x19, 0x8c, 0xac,
	0x6f, 0xb1, 0x6f, 0xdc, 0x04, 0x27, 0x3a, 0x00, 0xd6, 0xae, 0xfa, 0xe1,
	0xf7, 0x30, 0xa4, 0xdb, 0xd5, 0x86, 0x5a, 0x07, 0x11, 0xde, 0xea, 0xf4,
	0xb0, 0x83, 0x16, 0xbb, 0xc6, 0x00, 0x6e, 0xf2, 0x6b, 0x40, 0x81, 0x01,
	0x67, 0x0e, 0xa9, 0x82, 0x23, 0x04, 0x34, 0xed, 0x02, 0xf5, 0xe4, 0x0e,
	0x58, 0xe8, 0x8a, 0x58, 0x57, 0xb0, 0x56, 0x65, 0x3d, 0x40, 0x64, 0x03,
	0x6e, 0x7b, 0x07, 0x20, 0x99, 0x90, 0x36, 0x95, 0x9f, 0xdf, 0x3d, 0xe8,
	0x00, 0xa0, 0x57, 0x8f, 0x6d, 0xa4, 0xb3, 0x1d, 0x7a, 0x06, 0xa8, 0x26,
	0x41, 0xb0, 0x8c, 0x9c, 0x10, 0x85, 0x6c, 0xb4, 0x31, 0xa6, 0x5b, 0x7a,
	0x10, 0x51, 0x15, 0x3c, 0xa2, 0x42, 0xd3, 0x23, 0x02, 0xc0, 0x17, 0x7e,
	0x03, 0x28, 0xba, 0xce, 0x9b, 0xae, 0xdd, 0x1a, 0x19, 0xd0, 0x15, 0xac,
	0xeb, 0x20, 0x3c, 0x3a, 0x00, 0xc6, 0xbb, 0x8a, 0xd5, 0x64, 0xc2, 0x21,
	0x1d, 0x6c, 0x15, 0x5a, 0xd3, 0x44, 0x98, 0x14, 0x95, 0xb3, 0xb7, 0xdd,
	0xa6, 0xea, 0x06, 0x54, 0x78, 0xc3, 0xe8, 0x79, 0x9b, 0x86, 0x29, 0x76,
	0x8b, 0x6b, 0xaa, 0x0d, 0xa8, 0x2f, 0x22, 0x2a, 0xeb, 0x68, 0x81, 0x6c,
	0x56, 0xfd, 0x79, 0xac, 0x79, 0x4b, 0xa0, 0x01, 0x3f, 0x17, 0x43, 0x82,
	0xb4, 0xd5, 0x00, 0x14, 0xb7, 0xf5, 0x00, 0xf4, 0x15, 0xa8, 0xd7, 0x4b,
	0xb1, 0xbc, 0xa8, 0x36, 0x98, 0xf0, 0x8c, 0xe7, 0xf4, 0x7b, 0x35, 0xd8,
	0xad, 0x0d, 0x5f, 0x9d, 0x96, 0xab, 0xed, 0x48, 0xe2, 0xdc, 0x1c, 0xbe,
	0x12, 0xfa, 0x41, 0x6f, 0xf5, 0x1e, 0xb6, 0x9f, 0xee, 0xac, 0x21, 0xf4,
	0xf6, 0x00, 0x38, 0xb1, 0x1f, 0xfd, 0xd0, 0x0e, 0xc7, 0xdd, 0xa0, 0x39,
	0x07, 0x8c, 0x35, 0x1f, 0x7e, 0xcc, 0xbf, 0xf6, 0xe0, 0x06, 0x66, 0x7d,
	0x10, 0x3f, 0xc5, 0x3e, 0xde, 0x42, 0xf9, 0x3d, 0x00, 0x54, 0x81, 0x67,
	0x8a, 0xe6, 0x63, 0x0d, 0x01, 0xd0, 0x31, 0xe0, 0x6e, 0xd0, 0xe1, 0x59,
	0xf6, 0x1b, 0xf7, 0x0d, 0x52, 0x06, 0x80, 0x61, 0x4f, 0xe8, 0x77, 0xdd,
	0x6f, 0x48, 0x20, 0x1d, 0xbb, 0x2a, 0x16, 0x8b, 0x54, 0x87, 0x92, 0x83,
	0xe6, 0x8f, 0x55, 0x59, 0x06, 0x00, 0xe9, 0xc5, 0xce, 0x21, 0x63, 0x87,
	0xaf, 0x86, 0xcc, 0xba, 0xd6, 0xe7, 0x00, 0xf6, 0x91, 0x92, 0x92, 0xea,
	0xe8, 0x42, 0x06, 0x69, 0x13, 0xf5, 0x00, 0xd0, 0xb0, 0xa7, 0xcb, 0x4c,
	0xb0, 0xd2, 0x2d, 0x28, 0x63, 0xf0, 0x6a, 0xc7, 0x80, 0x6a, 0x19, 0xb2,
	0x66, 0x51, 0xf3, 0xb1, 0x21, 0xa0, 0x48, 0xad, 0x1e, 0x80, 0x62, 0xaf,
	0x00, 0xf4, 0xa5, 0x4e, 0x83, 0x75, 0x1b, 0xfe, 0x00, 0xc4, 0xcf, 0x55,
	0xb2, 0x50, 0xa6, 0xeb, 0x38, 0xed, 0x8f, 0xd3, 0x1d, 0x00, 0xf6, 0xe3,
	0x90, 0x1c, 0x60, 0x9e, 0x8e, 0xeb, 0x0b, 0xba, 0x44, 0x06, 0x68, 0xbb,
	0xd3, 0x10, 0x63, 0x35, 0xe1, 0x86, 0x5c, 0x5c, 0x2b, 0x85, 0xa6, 0xe7,
	0x38, 0x2c, 0x18, 0x83, 0x1f, 0x8f, 0x9b, 0x8e, 0x4d, 0x26, 0xcd, 0x34,
	0x0c, 0x66, 0x1d, 0x70, 0xb7, 0x01, 0xe6, 0x02, 0xa8, 0x51, 0x63, 0xcf,
	0xbb, 0x03, 0xca, 0x85, 0xc6, 0x9c, 0xf6, 0xf1, 0x51, 0xe0, 0x60, 0x07,
	0x40, 0x86, 0xf0, 0x1e, 0x6e, 0xef, 0x61, 0x10, 0xd9, 0x36, 0xcc, 0xfc,
	0x58, 0xe2, 0x37, 0x0d, 0x58, 0xb7, 0xbe, 0xca, 0xc9, 0xd8, 0xcd, 0xaa,
	0xd5, 0x5b, 0x77, 0x83, 0xcb, 0x0e, 0x30, 0xce, 0xc8, 0xb8, 0xcd, 0xbf,
	0x1e, 0x63, 0x04, 0xad, 0xb7, 0xcd, 0x43, 0x62, 0x4c, 0xe0, 0x1a, 0xd4,
	0x21, 0xe2, 0xdd, 0x33, 0xdf, 0xb1, 0xdd, 0xdc, 0x01, 0x22, 0x18, 0xce,
	0xa1, 0xd8, 0xcb, 0x67, 0xd5, 0x38, 0x4a, 0xbc, 0xd5, 0x81, 0x3d, 0x03,
	0x98, 0x35, 0x60, 0x41, 0x85, 0x0c, 0x1d, 0xe7, 0x76, 0xf8, 0x11, 0x52,
	0x76, 0xf6, 0x06, 0x16, 0x02, 0x45, 0xc8, 0xd8, 0x2f, 0x5e, 0x57, 0xbc,
	0x3b, 0x89, 0x97, 0x09, 0x3e, 0x03, 0x34, 0x1a, 0x9d, 0x37, 0x87, 0x48,
	0x0a, 0xe0, 0xa7, 0x4f, 0x8c, 0x3a, 0xa2, 0xaf, 0xfd, 0x7b, 0x80, 0xcf,
	0xe5, 0x18, 0x61, 0x68, 0xba, 0x61, 0x8b, 0x09, 0xaa, 0xa3, 0x0c, 0x47,
	0x3c, 0x43, 0x03, 0xac, 0xa3, 0x2e, 0x5e, 0x72, 0x0c, 0x80, 0x19, 0x61,
	0xe6, 0x6e, 0x0e, 0xd9, 0xe8, 0xe8, 0xaf, 0x11, 0x9b, 0x4a, 0x73, 0x7a,
	0x61, 0x66, 0xf0, 0x54, 0x1d, 0x18, 0xc8, 0x23, 0x36, 0xbf, 0xb5, 0xf4,
	0x86, 0x54, 0xed, 0xb5, 0x91, 0xee, 0xb8, 0xbc, 0xde, 0xc3, 0x87, 0x9b,
	0x2f, 0x81, 0xf2, 0xee, 0xa3, 0xec, 0x02
};

/**
 * Uncompressed size of \c #srcZstd.
 */
#define DXT1_256x256 32768

/**
 * Destination for decoding \c #srcZstd.
 */
static uint8_t dstDxt1[DXT1_256x256] = {};

#ifndef ZSTD_VERSION_MAJOR
/**
 * For the case where the decompression library hasn't been included we add a
 * dummy function to fake the process and stop the buffers being optimised out.
 */
size_t ZSTD_decompress(void* dst, size_t dstLen, const void* src, size_t srcLen) {
	return (memcmp(dst, src, (srcLen < dstLen) ? srcLen : dstLen)) ? dstLen : 0;
}
#endif

//*************************** Program and Shaders ***************************/

/**
 * Program object ID.
 */
static GLuint progId = 0;

/**
 * Vertex shader ID.
 */
static GLuint vertId = 0;

/**
 * Fragment shader ID.
 */
static GLuint fragId = 0;

//********************************* Uniforms *********************************/

/**
 * Quad rotation angle ID.
 */
static GLint uRotId = -1;

/**
 * Draw colour ID.
 */
static GLint uTx0Id = -1;

//******************************* Shader Source ******************************/

/**
 * Vertex shader to draw texture mapped polys with an applied rotation.
 */
static GLchar const vertShader2D[] =
#if GL_ES_VERSION_2_0
	"#version 100\n"
	"precision mediump float;\n"
#else
	"#version 120\n"
#endif
	"uniform   float uRot;"	// rotation
	"attribute vec2  aPos;"	// vertex position coords
	"attribute vec2  aUV0;"	// vertex texture UV0
	"varying   vec2  vUV0;"	// (passed to fragment shader)
	"void main() {"
	"	float cosA = cos(radians(uRot));"
	"	float sinA = sin(radians(uRot));"
	"	mat3 rot = mat3(cosA, -sinA, 0.0,"
	"					sinA,  cosA, 0.0,"
	"					0.0,   0.0,  1.0);"
	"	gl_Position = vec4(rot * vec3(aPos, 1.0), 1.0);"
	"	vUV0 = aUV0;"
	"}";

/**
 * Fragment shader for the above polys.
 */
static GLchar const fragShader2D[] =
#if GL_ES_VERSION_2_0
	"#version 100\n"
	"precision mediump float;\n"
#else
	"#version 120\n"
#endif
	"uniform sampler2D uTx0;"
	"varying vec2      vUV0;" // (passed from fragment shader)
	"void main() {"
	"	gl_FragColor = texture2D(uTx0, vUV0);"
	"}";

/**
 * Helper to compile a shader.
 * 
 * \param type shader type
 * \param text shader source
 * \return the shader ID (or zero if compilation failed)
 */
static GLuint compileShader(GLenum const type, const GLchar* text) {
	GLuint shader = glCreateShader(type);
	if (shader) {
		glShaderSource (shader, 1, &text, NULL);
		glCompileShader(shader);
		GLint compiled;
		glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
		if (compiled) {
			return shader;
		} else {
			GLint logLen;
			glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLen);
			if (logLen > 1) {
				GLchar*  logStr = malloc(logLen);
				glGetShaderInfoLog(shader, logLen, NULL, logStr);
			#ifndef NDEBUG
				printf("Shader compilation error: %s\n", logStr);
			#endif
				free(logStr);
			}
			glDeleteShader(shader);
		}
	}
	return 0;
}

//********************************** Helpers *********************************/

/**
 * Vertex position index.
 */
#define GL_VERT_POSXY_ID 0

/**
 * Vertex UV0 index.
 */
#define GL_VERT_TXUV0_ID 1

 /**
  * \c GL vec2 storage type.
  */
struct vec2 {
	float x;
	float y;
};

/**
 * Combined 2D vertex and 2D texture coordinates.
 */
struct posTex2d {
	struct vec2 pos;
	struct vec2 uv0;
};

//****************************************************************************/

/**
 * Current quad rotation angle (in degrees, updated per frame).
 */
static float rotDeg = 0.0f;

/**
 * Emscripten (single) GL context.
 */
static EMSCRIPTEN_WEBGL_CONTEXT_HANDLE glCtx = 0;

/**
 * Emscripten resize handler.
 */
static EM_BOOL resize(int type, const EmscriptenUiEvent* e, void* data) {
	double surfaceW;
	double surfaceH;
	if (emscripten_get_element_css_size   ("#canvas", &surfaceW, &surfaceH) == EMSCRIPTEN_RESULT_SUCCESS) {
		emscripten_set_canvas_element_size("#canvas",  surfaceW,  surfaceH);
		if (glCtx) {
			glViewport(0, 0, (int) surfaceW, (int) surfaceH);
		}
	}
	(void) type;
	(void) data;
	(void) e;
	return EM_FALSE;
}

/**
 * Boilerplate to create a WebGL context.
 */
static EM_BOOL initContext() {
	// Default attributes
	EmscriptenWebGLContextAttributes attr;
	emscripten_webgl_init_context_attributes(&attr);
	if ((glCtx = emscripten_webgl_create_context("#canvas", &attr))) {
		// Bind the context and fire a resize to get the initial size
		emscripten_webgl_make_context_current(glCtx);
		emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_DOCUMENT, NULL, EM_FALSE, resize);
		resize(0, NULL, NULL);
		return EM_TRUE;
	}
	return EM_FALSE;
}

/**
 * Called once per frame (clears the screen and draws the rotating quad).
 */
static void tick() {
	glClearColor(1.0f, 0.0f, 1.0f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	if (uRotId >= 0) {
		glUniform1f(uRotId, rotDeg);
		rotDeg += 0.1f;
		if (rotDeg >= 360.0f) {
			rotDeg -= 360.0f;
		}
	}

	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
	glFlush();
}

/**
 * Creates the GL context, shaders and quad data, decompresses the Zstd data
 * and 'uploads' the resulting texture.
 * 
 * As a (naive) comparison, removing Zstd and building with "-Os -g0 s WASM=1
 * -lGL emscripten.c" results in a 15kB WebAssembly file; re-adding Zstd
 * increases the Wasm by 26kB.
 */
int main() {
	if (initContext()) {
		// Compile shaders and set the initial GL state
		if ((progId = glCreateProgram())) {
			 vertId = compileShader(GL_VERTEX_SHADER,   vertShader2D);
			 fragId = compileShader(GL_FRAGMENT_SHADER, fragShader2D);
			 
			 glBindAttribLocation(progId, GL_VERT_POSXY_ID, "aPos");
			 glBindAttribLocation(progId, GL_VERT_TXUV0_ID, "aUV0");
			 
			 glAttachShader(progId, vertId);
			 glAttachShader(progId, fragId);
			 glLinkProgram (progId);
			 glUseProgram  (progId);
			 uRotId = glGetUniformLocation(progId, "uRot");
			 uTx0Id = glGetUniformLocation(progId, "uTx0");
			 if (uTx0Id >= 0) {
				 glUniform1i(uTx0Id, 0);
			 }
			
			 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
			 glEnable(GL_BLEND);
			 glDisable(GL_DITHER);

			 glCullFace(GL_BACK);
			 glEnable(GL_CULL_FACE);
		}
		
		GLuint vertsBuf = 0;
		GLuint indexBuf = 0;
		GLuint txName   = 0;
		// Create the textured quad (vert positions then UVs)
		struct posTex2d verts2d[] = {
			{{-0.85f, -0.85f}, {0.0f, 0.0f}}, // BL
			{{ 0.85f, -0.85f}, {1.0f, 0.0f}}, // BR
			{{-0.85f,  0.85f}, {0.0f, 1.0f}}, // TL
			{{ 0.85f,  0.85f}, {1.0f, 1.0f}}, // TR
		};
		uint16_t index2d[] = {
			0, 1, 2,
			2, 1, 3,
		};
		glGenBuffers(1, &vertsBuf);
		glBindBuffer(GL_ARRAY_BUFFER, vertsBuf);
		glBufferData(GL_ARRAY_BUFFER,
			sizeof(verts2d), verts2d, GL_STATIC_DRAW);
		glVertexAttribPointer(GL_VERT_POSXY_ID, 2,
			GL_FLOAT, GL_FALSE, sizeof(struct posTex2d), 0);
		glVertexAttribPointer(GL_VERT_TXUV0_ID, 2,
			GL_FLOAT, GL_FALSE, sizeof(struct posTex2d),
				(void*) offsetof(struct posTex2d, uv0));
		glGenBuffers(1, &indexBuf);
		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
		glBufferData(GL_ELEMENT_ARRAY_BUFFER,
			sizeof(index2d), index2d, GL_STATIC_DRAW);
		glEnableVertexAttribArray(GL_VERT_POSXY_ID);
		glEnableVertexAttribArray(GL_VERT_TXUV0_ID);
		
		// Decode the Zstd data and create the texture
		if (ZSTD_decompress(dstDxt1, DXT1_256x256, srcZstd, sizeof srcZstd) == DXT1_256x256) {
			glGenTextures(1, &txName);
			glBindTexture(GL_TEXTURE_2D, txName);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
			glCompressedTexImage2D(GL_TEXTURE_2D, 0,
				GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
					256, 256, 0, DXT1_256x256, dstDxt1);
		} else {
			printf("Failed to decode Zstd data\n");
		}
		emscripten_set_main_loop(tick, 0, EM_FALSE);
		emscripten_exit_with_live_runtime();
	}
	return EXIT_FAILURE;
}
